Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268


Thu., May 25, 2017, at 3:00 PM - 4:00 PM (refreshments served 2:40 PM)

Four-body Calculation of Tetra Neutron System

Emiko Hiyama, Nishina Center, RIKEN, Wako, 351-0198, Japan
Bldg. 6008 Large Conference Room

In 2016, an experiment group using RIBF in RIKEN observed four-neutron system as a narrow resonant state, that is, tetra neutron with atomic number 0 [1]. Then, it is requested to investigate theoretically by solving the quantum four-body problem accurately, (i) whether or not we can explain this system, and (ii) what kind of new understanding we can extract from this RIKEN experiment. Using Gaussian Expansion Method which have been developed by our group, we found as follows: To describe resonant state, we introduce a phenomenological T=3/2 three-neutron force. We find that to generate narrow 4n resonant states, a remarkably attractive 3N force in the T=3/2 channel is required[2].

In the seminar, I will explain Gaussian Expansion Method and structure of tetra neutron system.

[1] K. Kisamori et al., Phys. Rev. Letters 116, 052501 (2016).

[2] E. Hiyama, R. Lazauskas, J. Carbonell and M. Kamimura, Phys. Rev. C 93, 044004 ( 2016).